Syrian opposition groups including Al Qaeda affiliated Nusra Front have executed a bombing in a tunnel under Aleppo castle in the regime-held old part of the city, according to a monitoring group.
The Syrian Observatory for Human Rights (SOHR) reported Thursday that
“A massive explosion has been heard in Aleppo city, caused by detonating a tunnel in old Aleppo under Aleppo castle, led to material damages.”
More details were not available at the moment, but usually the Syrian opposition fighters dig tunnels underground to reach the main bastions of the regime inside cities.
Once the fighters reach exactly under the required target they fill the tunnel with explosives and detonate it by remote control from outside, causing much damage and losses for the regime.
It takes months of working underground to dig the tunnels under hard conditions and with primitive means.
The last tunnel bombing carried out by Syrian opposition and Nusra Front fighters was in the west of Aleppo city when Nusra fighters succeeded in bombing a tunnel under the Air Force intelligence headquarters, which was a stronghold for high ranking regime officials.
Activists said that regime forces used the intelligence facility as a "center of torture" for prisoners. At least 50 regime troops were killed and dozens injured.
According to UN estimates more than 220,000 people have been killed in Syria since the start of the war that started as an uprise and descended later into a complex civil war. More than 6.7 million people have fled the country while millions of others are displaced internally.